From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
To: Xilin Wu <sophon@radxa.com>, Bjorn Helgaas <bhelgaas@google.com>,
Andrzej Hajda <andrzej.hajda@intel.com>,
Neil Armstrong <neil.armstrong@linaro.org>,
Robert Foss <rfoss@kernel.org>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Jonas Karlman <jonas@kwiboo.se>,
Jernej Skrabec <jernej.skrabec@gmail.com>,
Luca Ceresoli <luca.ceresoli@bootlin.com>,
David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konradybcio@kernel.org>,
Bartosz Golaszewski <brgl@kernel.org>,
Linus Walleij <linusw@kernel.org>
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
linux-arm-msm@vger.kernel.org, linux-gpio@vger.kernel.org,
Stephen Chen <stephen@radxa.com>, Junhao Xie <bigfoot@radxa.com>
Subject: Re: [PATCH 1/6] PCI: of: Avoid config reads for disabled bridge nodes
Date: Wed, 2 Sep 2026 10:43:56 +0200 [thread overview]
Message-ID: <8c2eaba0-c1bd-4db0-bbc8-5ae3b3d9a13c@oss.qualcomm.com> (raw)
In-Reply-To: <20260901-q8b-dts-v1-1-7de0b6a73d08@radxa.com>
On 9/1/26 10:47 AM, Xilin Wu wrote:
> The TC9563 PCI power-control driver powers off external downstream ports
> whose device tree nodes have status = "disabled".
>
> On the Radxa Dragon Q8B, reading the Vendor ID from one of these
> powered-off port functions during PCI enumeration raises an Arm SError
> instead of returning an all-ones PCI error response. This prevents the
> board from completing boot.
I agree with the premise of the patch, but I'd like to understand why
that happens - do you have any details?
Konrad
next prev parent reply other threads:[~2026-09-02 8:44 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-01 8:47 [PATCH 0/6] arm64: dts: qcom: Add support for Radxa Dragon Q8B Xilin Wu
2026-09-01 8:47 ` [PATCH 1/6] PCI: of: Avoid config reads for disabled bridge nodes Xilin Wu
2026-09-01 8:55 ` sashiko-bot
2026-09-02 8:43 ` Konrad Dybcio [this message]
2026-09-02 9:31 ` Xilin Wu
2026-09-03 14:40 ` Konrad Dybcio
2026-09-03 14:41 ` Xilin Wu
2026-09-10 15:04 ` Manivannan Sadhasivam
2026-09-15 15:04 ` Xilin Wu
2026-09-15 16:20 ` Manivannan Sadhasivam
2026-09-15 16:31 ` Manivannan Sadhasivam
2026-09-01 8:47 ` [PATCH 2/6] dt-bindings: display: bridge: simple: document Chrontel CH7218A Xilin Wu
2026-09-01 8:52 ` sashiko-bot
2026-09-03 12:29 ` Krzysztof Kozlowski
2026-09-01 8:47 ` [PATCH 3/6] drm/bridge: simple: add " Xilin Wu
2026-09-01 8:51 ` sashiko-bot
2026-09-01 8:47 ` [PATCH 4/6] dt-bindings: arm: qcom: document Radxa Dragon Q8B Xilin Wu
2026-09-01 8:52 ` sashiko-bot
2026-09-03 12:36 ` Krzysztof Kozlowski
2026-09-01 8:47 ` [PATCH 5/6] dt-bindings: pinctrl: qcom,sc8280xp-tlmm: allow gpio-line-names Xilin Wu
2026-09-01 8:55 ` sashiko-bot
2026-09-01 14:17 ` Konrad Dybcio
2026-09-03 12:35 ` Krzysztof Kozlowski
2026-09-16 13:13 ` Linus Walleij
2026-09-01 8:47 ` [PATCH 6/6] arm64: dts: qcom: sc8280xp: add Radxa Dragon Q8B Xilin Wu
2026-09-01 9:05 ` sashiko-bot
2026-09-03 11:00 ` [PATCH 0/6] arm64: dts: qcom: Add support for " Daniele Briguglio
2026-09-07 8:48 ` (subset) " Bartosz Golaszewski
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